Update render-fidelity "update-screenshots" CLI to have more options.

[bhouston]

Description

We need better CLI options for the update-screenshot CLI tool.

Specifically I would like to see:

• allow for picking one or more render engines, not just one.
• allow for picking any subset of scenarios via string matches.
• enable headless or not. Because having Chrome pop up repeated is disruptive to local development.
• enable parallel renderer runs (excluding Stellar, and V-Ray), because it will be faster and there is amble CPU available for this.

Something like:

% npm run update-screenshots --renderer=filament --renderer=model-viewer --scenario=anisotropy --headless=true --parallel=true

Or something like this:

% npx update-screenshots -r filament -r model-viewer -s anisotropy -h -p

I was thinking of using commander for the CLI parsing as it is sort of industry standard.

[elalish]

Agreed, that would be a fantastic update!

[elalish]

Fixed by #4542, thanks!